Things work perfectly in FireFox. In Chrome everything loads fine, but some blur effects are introduced once you start resizing the window. I could live with that.

Safari though, it doesn't matter, it's all blurry all the time. If you dramatically increase the page width it looks like a VHS tape on your HDTV... Even if you set the width of the browser to the native width of the composition, simply checking the 'responsive scaling' box introduces a significant amount of blur.